Nature of Operations, Basis of Presentation and Summary of Accounting Policies (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items]
Goodwill	$ 360,000,000	$ 360,000,000
Reserve for estimated remediation liabilities	$ 65,000,000
Minimum
Summary Of Significant Accounting Policies [Line Items]
Long-term contracts with customers remaining duration	1 year
Maximum
Summary Of Significant Accounting Policies [Line Items]
Long-term contracts with customers remaining duration	12 years
Exploration and Production
Summary Of Significant Accounting Policies [Line Items]
Contract asset	$ 0	0
Contract liability	$ 0	$ 0
Midstream
Summary Of Significant Accounting Policies [Line Items]
Initial revenue contract period	10 years	10 years	10 years
Additional revenue contract period	10 years	10 years	10 years
Goodwill	$ 360,000,000
Midstream | Water Handling Services
Summary Of Significant Accounting Policies [Line Items]
Initial revenue contract period	14 years	14 years	14 years
Additional revenue contract period	10 years	10 years	10 years
Hess Midstream LP
Summary Of Significant Accounting Policies [Line Items]
Ownership percentage in variable interest entity	47.00%